February 2, 2019

Where do comets come from?

Comets originate far out in the solar system – some from the Kuiper belt of icy bodies beyond the orbit of Neptune, and others from a […]
February 2, 2019

How could we defend Earth from a large asteroid or comet?

In 2013, NASA announced its “Grand Challenge” to locate any nasty asteroids heading our way and prevent their impact. Rock-stopping options include: Nuking it: Attack the […]
February 2, 2019

Why did ancient humans paint cave walls?

Ice Age beasts and geometric designs, hunting parties and herds of horses – the painted imagery of our ancestors took many shapes and styles. As far […]
February 2, 2019

Where is Cueva de las Manos (Cave of the Hands) located? When was it painted?

It is located in Santa Cruz, Argentina. It was painted 13,000 years ago. Profiles of human hands, perhaps created in some sort of coming-of-age ritual, join […]